Saunier-Duval-Thema-Classic-F24e-Installation-manual

18 Replacement of Parts18.32 (F24E Only) Three-way valve actuator,refer to diagram 18.21.Before starting refer to the front of Section 18 Importantinformation.• Remove the front panel, refer to Section 15.3.• Lower the control panel, refer to Section 15.4.• Drain down the boiler only, refer to relevant part of diagram18.1.• Remove the gas control valve, refer to Section 18.28.• Remove 3-way valve head, refer to Section 18.31.• Remove the three way valve actuator.18.33 Ignition unit, refer to diagram 18.22.Before starting refer to the front of Section 18 Importantinformation.• Remove the front panel, refer to Section 15.3.• Lower the control panel, refer to Section 15.4.• For ease of access remove the left hand side panel, refer toSection 15.6.• Disconnect electrical connections.• Remove ignition unit securing screw.• Pull upwards to release and remove the ignition unit from theretaining slot.➜DOMESTIC HOT WATER PLATE TOPLATE HEAT EXCHANGER➜➜➜11596977518.34 (F24E Only) Domestic hot water plate toplate heat exchangerBefore starting refer to the front of Section 18 Importantinformation.• Remove the front panel, refer to Section 15.3.• Lower the control panel, refer to Section 15.4.• Drain down the boiler and hotwater circuit ,refer to relevantparts of diagram 18.1.• Unclip the central heating thermistor.• Unscrew the heating flow pipe union nut, swing pipe forwards.• Remove the gas supply pipe between the gas control valveand injector bar, see diagram 18.23.• Disconnect the union connection from the expansion vessel.• Supporting domestic hot water plate to plate heat exchanger,unscrew and remove two screws securing it onto pumpmounting and 3-way valve/bypass housing.• Remove plate to plate heat exchanger from boiler.• Fit replacement plate to plate heat exchanger.Note: Plate to plate heat exchanger mounting screws are offsetto ensure correct fitting.F24E only➜9773EXPANSION VESSELDiagram 18.2397719772F24E shownDiagram 18.244000124050-250